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4075. Of the 1000 lamps, 640 belongs to the 1st install 2019

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Description

4075. Of the 1000 lamps, 640 belongs to the 1st installment, the 80th to the 2nd and the rest to the 3rd installment. In the first batch of 6%, in the second 5%, in the third 4% of defective lamps. One lamp is selected at random. Determine the probability that the selected lamp is defective.

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Additional information

Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)

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